as tensions are mounting, wolf blitzer takes you inside this crisis, the threats, what's at stake. watch a special edition of the situation room tonight at 6:00 eastern. >>> and finally, it is here. the super bowl of college basketball. a preview of the hoopla on and off the court. rachel nichols joining me inside studio 7. final four fever next. up my moderate to severe plaque psoriasis. i decided enough is enough. ♪ [ spa lady ] i started enbrel. it's clinically proven to provide clearer skin. [ rv guy ] enbrel may not work for everyone -- and may not clear you completely, but for many, it gets skin clearer fast, within 2 months, and keeps it clearer through 6 months. [ male announcer ] enbrel may lower your ability to fight infections. serious, sometimes fatal events, including infections, tuberculosis, lymphoma, other cancers, nervous system and blood disorders, and allergic reactions have occurred. before starting enbrel, your doctor should test you for tuberculosis and discuss whether you've been to a region where certain fungal infections are common. you should not start e